We have introduced Abstract Classes and Interfaces in the lectures. In this lab,

Question

We have introduced Abstract Classes and Interfaces in the lectures. In this lab, we would like to provide few questions to review these topics and hands-on to solve them. Write a class named Octagon that extends GeometricObject and implements the Comparable and Cloneable interfaces. Assume that all eight sides of the octagon arc of equal length. The area can be computed using the following formula: area = (2 + 4/Squareroot 2) * side * side Write a test program that creates an Octagon object with side value 9 and displays its area and perimeter. Create a new object using the clone () method and compare the two objects using the compareTo () method. Expected results: Area is 391.10 Perimeter is 72.0 Compare the methods 0

Explanation / Answer

/*
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/**
*
* @author Surya
*/
public class Octagon //extends GeometricObject implements Comparable,Cloneable
{
    double area;
    double perimeter;

  
    private Octagon(double side)
    {
       area = ((2+4/Math.sqrt(2))*side*side);//calculating area with formula
       perimeter =side*8;//calculating perimeter
    }
  
public static void main(String argv[])
{
    //test program
Octagon o = new Octagon(9.0);
System.out.println("Area is "+Math.round(o.area*100.0)/100.0);
System.out.println("Perimeter is "+Math.round(o.perimeter*100.0)/100.0);
}
}

ouput:-

run:
Area is 391.1
Perimeter is 72.0
BUILD SUCCESSFUL (total time: 0 seconds)

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